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On 2 December, he ordered his forces to attack the Austro-Hungarians all along the front and informed his officers that the offensive was to have the specific purpose of improving Serbian morale. Determined to play his part, the aging Serbian king, Peter I, took a rifle and accompanied his troops to the front. The Serbian offensive caught the Austro-Hungarians by surprise, and at the time that the attack was launched they were holding a large military parade through the streets of Belgrade. The Austro-Hungarians now found themselves defending along an over-extended front as Potiorek had just begun strengthening his left flank, leaving the front line very lightly held. Potiorek knew that he could avoid a serious reversal on the battlefield by preventing the Serbian 1st Army from reaching the watershed of the Kolubara and Morava rivers, but the Serbs were confident. They discovered that the Austro-Hungarians had failed to adequately prepare for a Serbian counterattack, as their artillery was positioned well behind the front line. This meant that the Austro-Hungarian defenders would be unable to use their heavy guns to break up any Serbian advance. Rested and resupplied, the Serbs pushed forward towards Belgrade. By the night of 2 December, the Serbian 1st Army pushed several kilometres past Austro-Hungarian lines, taking a large number of prisoners and inflicting heavy casualties on the Austro-Hungarians. The 2nd and 3rd armies captured a number of important positions on high ground, while the Užice Army met fierce resistance but was ultimately able to push the Austro-Hungarians back.
The offensive's initial success served to greatly enhance the morale of Serbian troops, just as Putnik had wanted. Significantly weakened, the Austro-Hungarians did not have time to recover before the offensive resumed the following morning and they were forced into retreat by the end of the day. On 6 December, the British ambassador to Serbia informed the British Government that the Serb offensive was "progressing brilliantly". That day, the Serbian Army had broken the Austro-Hungarians at their centre and on their right flank. Outmanoeuvred, the Austro-Hungarians were forced into a full retreat, abandoning their weapons and equipment as they went. Meanwhile, the Austro-Hungarians attempted to consolidate control around Belgrade. On 7 December, they attacked the right flank of the Serbian Army in the city's outskirts.
On 8 December, the Austro-Hungarians fell back against Užice and Valjevo. The Serbs anticipated that their opponents would entrench themselves and attempt to block the Serbian Army's advance, but the Austro-Hungarians had failed to construct any defensive networks and, as such, were in no position to block the Serbian offensive.
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